Hi Andy, I am the original author of PoCoCl::UserAgent. I think selecting for errors probably does not make much sense for file URLs at all, so you could change the module to omit error selection for file URLs either entirely or on Solaris only, whatever your preference.
Also since I don't have time for PoCoCl::UserAgent anymore, it would be great if you or someone else who is interested in it could take over its development. My understanding is that it needs some changes in order to make it work with the current Parallel UserAgent. -- Kirill